import Vue from 'vue'
import VueRouter from 'vue-router'
import routes from './routers'
import store from '@/store'
import iView from 'iview'
import { canTurnTo } from '@/libs/util'
import { setAccessToken, getAccessToken } from '@/utils/token'

Vue.use(VueRouter)

const router = new VueRouter({
  routes,
  mode: 'history'
})

const LOGIN_PAGE_NAME = 'login'
const homeName = 'index'

const turnTo = (to, access, next) => {
  if (canTurnTo(to.name, access, routes)) next()
  // 有权限，可访问
  else next({ replace: true, name: 'error_401' }) // 无权限，重定向到401页面
}

router.beforeEach((to, from, next) => {
  iView.LoadingBar.start()
  const token = getAccessToken()
  if (!token && to.name !== LOGIN_PAGE_NAME) {
    // 未登录且要跳转的页面不是登录页
    next({
      name: LOGIN_PAGE_NAME, // 跳转到登录页
      query: { redirect: to.fullPath }
    })
  } else if (!token && to.name === LOGIN_PAGE_NAME) {
    // 未登陆且要跳转的页面是登录页
    next() // 跳转
  } else if (token && to.name === LOGIN_PAGE_NAME) {
    // 已登录且要跳转的页面是登录页
    next({
      name: homeName // 跳转到homeName页
    })
  } else {
    if (store.state.user.hasGetInfo) {
      turnTo(to, store.state.user.access, next)
    } else {
      store
        .dispatch('getUserInfo')
        .then(() => {
          // 拉取用户信息，通过用户权限和跳转的页面的name来判断是否有权限访问;access必须是一个数组，如：['super_admin'] ['super_admin', 'admin']
          turnTo(to, store.state.user.access, next)
        })
        .catch(() => {
          setAccessToken('')
          next({
            name: 'login'
          })
        })
    }
  }
})

export default router
